/Engine/Source/Runtime/Datasmith/DatasmithCore/Public/IDatasmithSceneElements.h
Adds a new child to the Actor Element
void AddChild ( const [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [IDatasmithActorElement](API\Runtime\DatasmithCore\IDatasmithActorElement) > & InChild, EDatasmithActorAttachmentRule AttachementRule )